Description

In the Linux kernel, the following vulnerability has been resolved: pinctrl: single: fix refcount leak in pcs_add_gpio_func() of_parse_phandle_with_args() returns a device_node pointer with refcount incremented in gpiospec.np. The loop iterates through all phandles but never releases the reference, causing a refcount leak on each iteration. Add of_node_put() calls to release the reference after extracting the needed arguments and on the error path when devm_kzalloc() fails. This bug was detected by our static analysis tool and verified by my code review.

References 8

• git.kernel.org https://git.kernel.org/stable/c/191bfd5710d6a7f48ba4315d8d3e908dcc15243c
• git.kernel.org https://git.kernel.org/stable/c/353353309b0f7afa407df29e455f9d15b5acc296
• git.kernel.org https://git.kernel.org/stable/c/3e3b28bb0b6ddc521a4fdd1c1ba0d35017a0796b
• git.kernel.org https://git.kernel.org/stable/c/456a60d06c09a92680dc35fabca68024badcc28e
• git.kernel.org https://git.kernel.org/stable/c/5b9e84d27e310f22c4ba45fedbc4f5baf43dd823
• git.kernel.org https://git.kernel.org/stable/c/7814b1431848854b56717086e2b61bea3c59753d
• git.kernel.org https://git.kernel.org/stable/c/99cc7352156c65201c675f750e0e77c4c73d93f5
• git.kernel.org https://git.kernel.org/stable/c/e2e367e56bacb93ce5ac73f0b3297d5c83d38dd4

Remediation